I am looking for a pinion yoke for my 66 mustang 6 cylinder. From what I read online my car has a 7.25" rear end. I have searched everywhere and I am unable to locate this pinion yoke. I have found a couple on ebay that say 25 spline but one of them says it's for an 8", and the other does not specify. Did Ford use two different spline yokes? How do I tell the difference between the one for the 8" and the one for the 7.25"?